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Prove that the formula for the volume V ...

Prove that the formula for the volume V of a tetrahedron, in terms of the lengths of three coterminous edges and their mutul inclinations is `V^2=(a^2b^2c^2)/36 |(1,cosphi,cospsi),(cosphi,1,costheta),(cospsi, costheta, 1)|`

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